Abstract: A method for operating a drive train by providing a primary drive machine, a working machine, a hydrodynamic clutch, and a temperature detection device; wherein at least in the case of a change from a load state and/or an operating state of the drive train thereby creating a new load state and a new operational state, the temperature of the hydrodynamic clutch is detected at the time of the change; wherein on the basis of the detected temperature and the new load state and/or the new operational state of the drive train, an expected temperature progression is calculated; and wherein a warning signal and/or a stop signal is issued for the primary drive machine if a temperature of the calculated temperature progression exceeds a predetermined maximum temperature within the expected duration of the new load state and/or the new operational state.

Abstract: A method for operating a drive train, comprising: providing a primary drive machine, a working machine, a hydrodynamic clutch, and a temperature detection device; wherein at least in the case of a change from a load state and/or an operating state of the drive train thereby creating a new load state and a new operational state, the temperature of the hydrodynamic clutch is detected at the time of the change; wherein on the basis of the detected temperature and the new load state and/or the new operational state of the drive train, an expected temperature progression is calculated; and wherein a warning signal and/or a stop signal is issued for the primary drive machine if a temperature of the calculated temperature progression exceeds a predetermined maximum temperature within the expected duration of the new load state and/or the new operational state.

Abstract: A travel drive for a trolley traveling gear of hoists has a drive train which has the properties of a freewheel as regards the direction of travel. Consequently load oscillation can be rapidly damped out because the speed of the traveling gear is not forcibly held constant during the semioscillation of the load in which it moves ahead of the traveling gear. On the contrary, the swinging load is able to drag the traveling gear behind it, accelerating it in the process, and in this way to convert oscillation energy into driving energy.

Abstract: An electric drive for the vehicle or traveling mechanism of a lifting appliance contains a control which controls the switching on of the mechanical brake and the switching of the motor current off and on again. In this case, there is provision, in the event of a changeover from a high traveling speed to slow maneuvering speed, for the mechanical brake to remain released until the maneuvering speed is approached. During this phase, the vehicle is decelerated solely by the internal friction and the rolling friction on the rail, in order to avoid inducing any or any additional load pendulum oscillation.